Improve HoogleSearch buffer interaction:

I've added a few enhancements to the HoogleSearch buffer behavior, but it should be compatible with the current version. The following changes were made:

- Pressing enter on the HoogleSearch buffer will take you directly to open hoogle --info for that line
- Pressing 'q' will close the HoogleSearch buffer

This works best by setting g:hoogle_search_jump_back to 0. I've only added this option to maintain compatibility with the current version, so feel free to remove the option if you think it should be the default.